Quote:
Originally Posted by qasdfdsaq
I've told you several times before but this is entirely misleading. The "frequency plan" of the two systems cannot be compared in this way, and also the frequency plan has nothing to do with why the two systems offer differing upload speeds and capacities. The term "frequency plan" doesn't even apply in the same way to either technology.
By your reckoning,
VM upstream operates between 18 Mhz and 45 Mhz and contains (up to) 4 upstreams of 6.4 Mhz each
BT upstream operates between 0 Mhz and 17 Mhz and contains two channels of 2.4 Mhz (actually one 1.6 and one 3.2)
How on earth does the latter allow a faster upstream to be offered?
---------- Post added at 11:29 ---------- Previous post was at 11:21 ----------
The real answer is very simple and it boils down to the fundamentals of how the two technologies work.
On Virgin Media cable, your cable is shared with dozens to hundreds of other people. Each cable may have enough capacity for 3 connections' worth and 300 people trying to use it. Virgin Media are counting on you not trying to all use it at the same time.
On BT/Openreach fibre, every single cable is dedicated and provides individual bandwidth to every single user. You get the full capacity of your line all to yourself. You're not sharing your speed between 300 other users.
Not entirely. VM can break the cable bundles (nodes) down so they are shared between fewer and fewer people, and this is an ongoing effort that all cable companies are trying to achieve - but each step costs exponentially more (although still less than it's costing BT to roll out their completely new fibre network)
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Ahh now that makes sense. So essentially they can relieve the problem by investing in the network but cannot eradicate. I always thought Virgin was fibre optic, so why can they not offer the same dedicate line?